<template>
  <div class="login_container">
    <div class="login_box">
      <!-- 头像区域 -->
      <div class="avatar_box">
        <img src="../assets/yt.jpg" alt />
      </div>
      <!-- 登陆区域 -->
      <el-form
        ref="loginFormRef"
        :model="loginForm"
        :rules="loginFormRule"
        label-width="0px"
        class="login_form"
      >
        <!-- 用户名 -->
        <el-form-item prop="username">
          <el-input
            v-model="loginForm.username"
            prefix-icon="iconfont icon-user"
            placeholder="请输入用户名"
          ></el-input>
        </el-form-item>
        <!-- 密码 -->
        <el-form-item prop="password">
          <el-input
            v-model="loginForm.password"
            prefix-icon="iconfont icon-3702mima"
            type="password"
            show-password
            placeholder="请输入密码"
          ></el-input>
        </el-form-item>
        <!-- 按钮区域 -->
        <el-form-item class="btns">
          <el-button type="primary" @click="login">登陆</el-button>
          <el-button type="info" @click="resetLoginForm">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  data () {
    return {
      //  登录表单数据绑定对象
      loginForm: {
        username: 'admin',
        password: '123456'
      },
      //  表单验证规则对象
      loginFormRule: {
        //  验证用户名
        username: [
          { required: true, message: '请输入登录名称', trigger: 'blur' }, // required 必填项 trigger 触发条件
          { min: 3, max: 7, message: '长度在 3 到 7 个字符', trigger: 'blur' }
        ],
        //  验证密码
        password: [
          { required: true, message: '请输入登录密码', trigger: 'blur' },
          {
            min: 6,
            max: 15,
            message: '长度在 6 到 15 个字符',
            trigger: 'blur'
          }
        ]
      }
    }
  },
  methods: {
    // 重置登陆表单
    resetLoginForm: function () {
      // console.log(this)
      this.$refs.loginFormRef.resetFields()// this.$ref.loginFormRef为表单的实例对象
    },
    //  登陆
    login () {
      this.$refs.loginFormRef.validate(async valid => {
        // console.log(valid)
        if (!valid) { return }
        const { data: res } = await this.$http.post('login', this.loginForm)// 在mainjs里把axios挂载到this的http上，参数1路径，参数2携带参数
        // console.log(res)
        if (res.meta.status !== 200) {
          return this.$message.error('登陆失败!')
        }
        this.$message.success('登陆成功!')
        // 项目中除了登陆之外的其他API接口都必须在登陆之后访问
        // 保存token到本地session,token只应在当前网站打开期间生效
        window.sessionStorage.setItem('token', res.data.token)
        // 通过编程式导航跳转到后台主页,路由地址'/home'
        this.$router.push('/home')
      })
    }
  }
}
</script>

<style lang="less" scoped>
// less less-loader 开发依赖 scoped 单文件样式
.login_container {
  background-color: #2b4b6b;
  height: 100%;
}

.login_box {
  width: 450px;
  height: 300px;
  background-color: #fff;
  border-radius: 3px;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
}

.avatar_box {
  width: 130px;
  height: 130px;
  border: 1px solid #eee;
  border-radius: 50%;
  padding: 10px;
  box-shadow: 0 0 10px #ddd;
  position: absolute;
  left: 50%;
  transform: translate(-50%, -50%);
  background-color: #fff;
  img {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background-color: #eee;
  }
}

.btns {
  display: flex;
  justify-content: flex-end;
}

.login_form {
  position: absolute;
  bottom: 0;
  width: 100%;
  padding: 0 20px;
  box-sizing: border-box;
}
</style>
